Description
Return their overlap duration and fraction of wave duration.
Research time coordinates can represent age, residence, observation, or follow-up. Fixed year lengths and censored intervals are modeling conventions; an unfinished observation supplies less timing information than a completed event.
Return their overlap duration and fraction of wave duration.
When to use this tool
Use Aging Panel Exposure Month Term when you need an ageing-research interval calculation with an explicit time basis.
How to use the tool and how it works
- Enter entryMonth, exitMonth, waveStartMonth, waveEndMonth. Use the units and conventions below.
- Run the tool. Correct any format, range, or cross-field input error before interpreting the output.
- Read exposureMonths, waveFraction. Use the output convention below.
Require ordered entry/exit months and a positive wave interval. Return their overlap duration and fraction of wave duration.1
| Input field | Meaning and units | Accepted input |
|---|---|---|
| entryMonth | Entry Month | Required. Finite number. |
| exitMonth | Exit Month | Required. Finite number. |
| waveStartMonth | Wave Start Month | Required. Finite number. |
| waveEndMonth | Wave End Month | Required. Finite number. |
| Output field | Interpretation | Returned shape |
|---|---|---|
| exposureMonths | Exposure Months | Required. Finite number. |
| waveFraction | Wave Fraction | Required. Finite number. |
{
"input": {
"entryMonth": 2,
"exitMonth": 10,
"waveStartMonth": 0,
"waveEndMonth": 12
},
"output": {
"exposureMonths": 8,
"waveFraction": 0.6666666666666666
}
}Limitations and assumptions
- Month inputs are numeric coordinates rather than dates; overlap does not establish actual exposure, continuous observation, survival, or a valid study cohort.
- Inputs must satisfy both the field types and the cross-field conditions above. Invalid input causes an error; a successful false flag or documented placeholder is a different result.
- Numeric calculations use binary floating point unless exact decimal-integer arithmetic is explicitly stated. No hidden measurement tolerance or decimal rounding is added; nonfinite or out-of-contract results are rejected. Numeric signed-zero results are exported as zero.
Alternative or Complementary methods
Use actual calendar dates for calendar age and an appropriate censoring-aware analysis for incomplete follow-up. Verify origin, units, and event definitions against the study protocol.
References
Similar or alternative tools
- Cohort Followup Exposure Share
Return adjusted denominator and followed/adjusted time.
- Gerontology Questionnaire Time Window Overlap
Require positive-length intervals, return their overlap and summed durations minus overlap as unionDuration, then divide overlap by union.